John b



JOHN B. CORNELL, OF NEW YORK, N. Y.

METALLIC WINDOV-SHUTTER.

Specification of Letters Patent No.

To all whom t may concern:

Be it known that I, JOHN B. CORNELL, of the city, county, and State ofNew York, have invented an Improved Fireproof Metallic lVindow-Shutter;and I do hereby declare that the following is a full and exactdescription thereof, reference being had to the accompanying drawings,making a part of this specification, Figures l and 2 beingV views ofopposite sides of said shutter and Fig. 3 a section in the line a, a ofFigs. l and 2.

Similar letters indicate like parts in each figure.

rIhe first thing to be done in manufacturing my improved metallicshutter, is to make a frame b, g, 7L, of T-shaped iron, and then twothicknesses c, d, of sheet-iron should be combined with said frame bymeans of a suitable number of rivets e, f, substantially as shown in thedrawings.

The border of the outer sheet-iron casing (l, of my improved shutter,should be trimmed off even with the edge of the outer lanch g, of theframe of the shutter, and the inner sheet-iron casing c, of saidshutter, should be fitted within the portion of said frame and shouldrest upon the inner flanch la, thereof; then, the inner series of rivetse, e, passing through both casings and also through the inner flanch h,of the frame, of the shutter, and the outer series of rivets f, f,passing through the border of the outer' casing d, and through the outertlanch g, of the frame of the shutter, will firmly unite the respectiveparts of my improved shutter to each other.

My improved metallic shutter clearly possesses the following advantages:to wit.

19,348, dated February 16, 1858.

In the irst place the shank b, of the T- 40 its frame by the most expertburglar.

Second, a frame composed of T-shaped iron must necessarily be muchstiffer, than a frame, of the same weight, made of square or flat-shapedbar-iron. Third, the inner casing c, of said shutter, being fittedaccurately within the central shank b, of the bar which composes theframe thereof, and being, by the same series of rivets, combined withthe outer casing CZ, of the shutter and with the inner lanch L, of itsframe, while the outer edge of the outer casing of the shutter iscombined with the outer lanch g, of its frame; by means of anotherseries of rivets, it is self-evident that a degree of heat which wouldinjuriously warp a shutter whose `frame was composed of fiat or squarebars of iron, would not exert any injurious effect upon my improvedshutter.

The within described method of constructing metallic window-shutters, isequally applicable to the construction of metallic doors, panels, orpartitions.

lWhat I claim as my invention and desire to secure by Letters Patent,is-

Constructingmetallic shutters, doors, &c.,

of double casings of sheet metal combined with a frame composed ofT-shaped metallic bars, substantially as herein set forth.

JOHN B. CORNELL.

lVitnesses Jos. W. MAUTERSTOCK, Trios. OROCKER.

